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EP0566758B2 - Detector unit for controlling a passenger protection system of a vehicle - Google Patents

Detector unit for controlling a passenger protection system of a vehicle Download PDF

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Publication number
EP0566758B2
EP0566758B2 EP92106898A EP92106898A EP0566758B2 EP 0566758 B2 EP0566758 B2 EP 0566758B2 EP 92106898 A EP92106898 A EP 92106898A EP 92106898 A EP92106898 A EP 92106898A EP 0566758 B2 EP0566758 B2 EP 0566758B2
Authority
EP
European Patent Office
Prior art keywords
sensor unit
damping element
sensor
housing
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92106898A
Other languages
German (de)
French (fr)
Other versions
EP0566758A1 (en
EP0566758B1 (en
Inventor
Josef Dipl.-Ing. Dirmeyer
Gerhard Dr. Dipl.-Phys. Mader
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Siemens AG filed Critical Siemens AG
Priority to EP92106898A priority Critical patent/EP0566758B2/en
Priority to DE59207007T priority patent/DE59207007D1/en
Priority to CA002094460A priority patent/CA2094460A1/en
Priority to JP5117590A priority patent/JPH0616097A/en
Publication of EP0566758A1 publication Critical patent/EP0566758A1/en
Application granted granted Critical
Publication of EP0566758B1 publication Critical patent/EP0566758B1/en
Publication of EP0566758B2 publication Critical patent/EP0566758B2/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0136—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to actual contact with an obstacle, e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • G01P1/003—Details of instruments used for damping
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/22—Secondary treatment of printed circuits
    • H05K3/28—Applying non-metallic protective coatings
    • H05K3/284—Applying non-metallic protective coatings for encapsulating mounted components
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/0026—Casings, cabinets or drawers for electric apparatus provided with connectors and printed circuit boards [PCB], e.g. automotive electronic control units
    • H05K5/0078—Casings, cabinets or drawers for electric apparatus provided with connectors and printed circuit boards [PCB], e.g. automotive electronic control units specially adapted for acceleration sensors, e.g. crash sensors, airbag sensors

Definitions

  • the invention relates to a sensor unit according to the preamble of claim 1.
  • a shock that hits the sensor unit directly at the Accident is soft compared to an abrupt one Impact, which hits the sensor unit directly on impact after accidentally dropping one of the Circuit housing containing sensor unit on a hard stone floor.
  • Such abrupt, hard shocks occur e.g. during the manufacture and final assembly of circuit housings which, in addition to the sensor unit, also the Trigger circuit for controlling a vehicle airbag system and the hard knock - possibly initially undetected - The sensor arrangement, which is at risk of breakage or deformation damaged.
  • DE 33 28 114 A1 describes a sensor unit for control of a vehicle occupant protection system is known, which a sensor arrangement with a seismic mass for Detect an acceleration and has a sensor capsule.
  • the sensor capsule is filled with oil to prevent vibrations to dampen a bending beam of the sensor arrangement.
  • GB 2 084 330 A is an acceleration sensor unit known, which is used in an aircraft, and which contains a silicone rubber jacket.
  • From US 3 383 565 is a housing for receiving several Circuit boards are known, with some of the circuit boards vertical arranged and arranged horizontally above it Printed circuit board electrically connected via lines are. The vertical circuit boards are just below theirs upper edge embedded in silicone rubber. Your top Edge, the leads and the horizontal circuit board are surrounded by a solid potting compound.
  • the drawing shows an embodiment of the invention.
  • the only figure in the drawing shows the sensor unit E, which are exemplary here through an encapsulated one, namely in a sensor capsule K attached, particularly sensitive to hard impacts Micromechanics M is formed, which in turn accelerations and / or delays using a seismic Can measure mass and especially fragile, contains delicate silicon parts.
  • the electrical Connections of the sensor unit E are in turn on one PCB T soldered.
  • this bracket H in turn is also soldered to the circuit board T.
  • the circuit board T together with the bracket H form a bracket H / T, which the sensor unit E is relatively rigid in its position able to hold.
  • the circuit board is in turn in a small chamber G / B or bay G / B one e.g. made of aluminum injection molding Circuit housing G / B / S attached.
  • G / B or bay G / B one e.g. made of aluminum injection molding Circuit housing G / B / S attached.
  • the electronics are housed, which is controlled by the sensor unit E and in the event of a vehicle accident, the occupant protection system should trigger.
  • a soft, resilient damping element that e.g. each a largely dimensionally stable lump of asphalt represents, cf. the mass D1.
  • damping elements cf. D1 and D2
  • One damping element D1 touches in the example shown the top of the sensor capsule K of the sensor unit E, and Parts of the bracket H, which in principle is also vibratable, whereby this damping element D1 also against Base G of the chamber G / B of the circuit housing G / B / S supports and thus additional vibrations in the metal of the circuit housing G / B / S also dampens.
  • the other sensor unit D2 touches in the example shown only a vibratable part T of the holder H / T of the sensor unit E without touching the sensor unit E itself.
  • this other damping element D2 is supported against the bottom B of the chamber G / B of the circuit housing G / B / S from which this additional damping element D2 additionally Vibrations in the metal of the bottom B of the circuit housing G / B / S dampens.
  • the damping element D1 / D2 consists according to the invention a soft, flexible mass, which vibrational energies dampens, e.g. made of sticky, tough, strongly damping Asphalt, - at least contains the damping element according to the invention such a vibration damping mass.
  • the Damping element D1 / D2 dampens one - compared to the impact that directly hits the sensor unit in the accident E acts - hard impact the occurring mechanical Vibrations of the sensor unit E.
  • the impact which is directly on the sensor unit at the Accident is soft compared to the abrupt impact, which directly on the sensor unit on impact after accidentally dropping the sensor unit or when dropping one containing the sensor unit Circuit housing acts.
  • the one in the accident on the sensor unit E impact is practically undamped transmitted from the sensor unit E, so that this shock at the invention by the break-sensitive micromechanics M can be measured - in general. without this Impact would destroy the micromechanics M.
  • the damping element therefore preferably dampens the high-frequency components the vibration from a hard impact, but preferably not those low-frequency components of mechanical shocks, which occur in an accident of the vehicle and for the electronics as an indication of the occurrence of a Serve accident.
  • the invention thus allows those abrupt, hard impacts to render harmless, e.g. during manufacturing and final assembly of circuit housings can occur e.g. by accidentally dropping the already finished equipped with the electronics and the sensor unit E. Circuit housing G / B / S, or by an accidental hard blow with a tool against that already in the vehicle built-in circuit housing G / B / S.
  • the invention therefore also avoids that G / B / S circuit housing accidentally along with their so damaged defective sensor units E can be installed in a motor vehicle or after installation - possibly undetected - damaged will.
  • the invention allows a wide variety of different Masses to be used as damping element D1 / D2, so that one - depending on the existing manufacturing facilities and depending on other needs like chemical neutrality - an optimal mass from the multitude of basically usable masses can choose. So it can Damping element D1 / D2 instead of an asphalt-like mass e.g. also silicone gel, moderately hardened adhesive material, Contain rubber or / or polyurethane or completely such masses exist.
  • an asphalt-like mass e.g. also silicone gel, moderately hardened adhesive material, Contain rubber or / or polyurethane or completely such masses exist.
  • a particularly good precaution against the risk of Breakage or permanent deformation of the sensor arrangement can be achieved in that the damping element D1 / D2 - exclusively or additionally - one in principle with Impact vibratable part of the bracket H / T touched.
  • the damping element D2 alone the circuit board T
  • the damping element D1 not only the sensor capsule K but also parts of the bracket H. This removes the from the circuit housing G / B / S vibrating energies flowing inwards to sensor unit E. strongly dampened when they are over the Spread bracket T / H towards sensor unit E.
  • the sensor unit E - wie is shown by way of example in the figure - a sensor capsule K included, in which the actual, against accelerations and / or delays sensitive sensor arrangement M is attached.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Air Bags (AREA)
  • Vibration Prevention Devices (AREA)

Description

Die Erfindung betrifft eine Sensoreinheit gemäß Oberbegriff des Patentanspruches 1.The invention relates to a sensor unit according to the preamble of claim 1.

Ein Stoß, welcher unmittelbar auf die Sensoreinheit bei dem Unfall wirkt, ist weich im Vergleich zu einem abrupten Stoß, welcher unmittelbar auf die Sensoreinheit beim Aufprall nach einem versehentlichen Fallenlassen eines die Sensoreinheit enthaltenden Schaltungsgehäuses auf einen harten Steinboden wirkt. Solche abrupten, harten Stöße treten z.B. während der Fertigung und Endmontage von Schaltungsgehäusen auf, welche neben der Sensoreinheit noch die Auslöseschaltung zur Steuerung eines Kfz-Airbagsystemes aufweisen und der harte Stoß - womoglich zunächst unerkannt - die bruchgefährdete bzw. verformungsgefährdete Sensoranordnung beschädigt.A shock that hits the sensor unit directly at the Accident is soft compared to an abrupt one Impact, which hits the sensor unit directly on impact after accidentally dropping one of the Circuit housing containing sensor unit on a hard stone floor. Such abrupt, hard shocks occur e.g. during the manufacture and final assembly of circuit housings which, in addition to the sensor unit, also the Trigger circuit for controlling a vehicle airbag system and the hard knock - possibly initially undetected - The sensor arrangement, which is at risk of breakage or deformation damaged.

Aus der DE 33 28 114 A1 ist eine Sensoreinheit zur Steuerung eines Insassenschutzsystems eines Fahrzeugs bekannt, die eine Sensoranordnung mit einer seismischen Masse zum Erkennen einer Beschleunigung sowie eine Sensorkapsel aufweist. Die Sensorkapsel ist mit Öl gefüllt, um Schwingungen eines Biegebalkens der Sensoranordnung zu dämpfen.DE 33 28 114 A1 describes a sensor unit for control of a vehicle occupant protection system is known, which a sensor arrangement with a seismic mass for Detect an acceleration and has a sensor capsule. The sensor capsule is filled with oil to prevent vibrations to dampen a bending beam of the sensor arrangement.

Aus der GB 2 084 330 A ist eine Beschleunigungssensoreinheit bekannt, die in einem Flugzeug eingesetzt wird, und die einen Mantel aus Silikongummi enthält. GB 2 084 330 A is an acceleration sensor unit known, which is used in an aircraft, and which contains a silicone rubber jacket.

Aus der US 3 383 565 ist ein Gehäuse zur Aufnahme mehrerer Leiterplatten bekannt, wobei einige der Leiterplatten vertikal angeordnet und mit einer horizontal darüber angeordneten Leiterplatte über Leitungen elektrisch verbunden sind. Die vertikalen Leiterplatten sind bis knapp unter ihren oberen Rand in Silikongummi eingebettet. Ihr oberer Rand, die Leitungen und die horizontale Leiterplatte sind von einer festen Vergußmasse umgeben.From US 3 383 565 is a housing for receiving several Circuit boards are known, with some of the circuit boards vertical arranged and arranged horizontally above it Printed circuit board electrically connected via lines are. The vertical circuit boards are just below theirs upper edge embedded in silicone rubber. Your top Edge, the leads and the horizontal circuit board are surrounded by a solid potting compound.

Die Aufgabe, Beschädigungen der Sensoranordnung bei solchen harten Stößen weitgehend zu vermeiden, wird erfindungsgemäß durch den im Patentanspruch 1 definierten Gegenstand gelöst.The task of damaging the sensor arrangement in such To largely avoid hard impacts is invented solved by the subject defined in claim 1.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous developments of the invention are in the subclaims featured.

Die Zeichnung zeigt ein Ausführungsbeispiel der Erfindung.The drawing shows an embodiment of the invention.

Die einzige Figur der Zeichnung zeigt die Sensoreinheit E, welche hier beispielhaft durch eine gekapselte, nämlich in einer Sensorkapsel K angebrachte, gegen harte Stöße besonders empfindliche Mikromechanik M gebildet wird, die ihrerseits Beschleunigungen und / oder Verzögerungen mittels einer seismischen Masse erfassen kann und dazu besonders bruchempfindliche, zarte Siliziumteile enthält. Die elektrischen Anschlüsse der Sensoreinheit E sind ihrerseits auf einer Leiterplatte T angelötet. Zusätzlich wird zur Versteifung die Sensoreinheit E noch mit einem metallischen hutähnlichen Bügel H gehalten, wobei dieser Bügel H seinerseits ebenfalls an der Leiterplatte T angelötet ist. Die Leiterplatte T zusammen mit dem Bügel H bilden eine Halterung H/T, welche die Sensoreinheit E relativ starr in ihrer Lage zu halten vermag.The only figure in the drawing shows the sensor unit E, which are exemplary here through an encapsulated one, namely in a sensor capsule K attached, particularly sensitive to hard impacts Micromechanics M is formed, which in turn accelerations and / or delays using a seismic Can measure mass and especially fragile, contains delicate silicon parts. The electrical Connections of the sensor unit E are in turn on one PCB T soldered. In addition to stiffening the sensor unit E still with a metallic hat-like H bracket H held, this bracket H in turn is also soldered to the circuit board T. The circuit board T together with the bracket H form a bracket H / T, which the sensor unit E is relatively rigid in its position able to hold.

Die Leiterplatte ist ihrerseits in einer kleinen Kammer G/B oder Bucht G/B eines z.B. aus Alu-Spritzguß bestehenden Schaltungsgehäuses G/B/S befestigt. Im Teil S - evtl. teilweise auch in der Kammer G/B - ist die Elektronik untergebracht, welche durch die Sensoreinheit E gesteuert wird und bei einem Unfall des Fahrzeuges das Insassenschutzsystem auslösen soll.The circuit board is in turn in a small chamber G / B or bay G / B one e.g. made of aluminum injection molding Circuit housing G / B / S attached. In part S - possibly partially also in the chamber G / B - the electronics are housed, which is controlled by the sensor unit E and in the event of a vehicle accident, the occupant protection system should trigger.

Erfindungsgemäß wird die Oberfläche der Sensoreinheit E von einem weichen nachgiebigen Dämpfungselement berührt, das jeweils z.B. einen weitgehend formstabile Asphaltklumpen darstellt, vgl. die Masse D1. Bei dem gezeigten Beispiel sind sogar zwei Dämpfungselemente angebracht, vgl. D1 und D2, die beide die Sensoreinheit E berühren.According to the invention, the surface of the sensor unit E of touches a soft, resilient damping element that e.g. each a largely dimensionally stable lump of asphalt represents, cf. the mass D1. In the example shown there are even two damping elements, cf. D1 and D2, both of which touch sensor unit E.

Das eine Dämpfungselement D1 berührt im gezeigten Beispiel die Oberseite der Sensorkapsel K der Sensoreinheit E, sowie Teile des im Prinzip ebenfalls vibrierfähigen Bügels H, wobei sich dieses Dämpfungselement D1 zusätzlich gegen den Grund G der Kammer G/B des Schaltungsgehäuse G/B/S abstützt und damit zusätzlich Vibrationen im Metall des Schaltungsgehäuses G/B/S ebenfalls dämpft.One damping element D1 touches in the example shown the top of the sensor capsule K of the sensor unit E, and Parts of the bracket H, which in principle is also vibratable, whereby this damping element D1 also against Base G of the chamber G / B of the circuit housing G / B / S supports and thus additional vibrations in the metal of the circuit housing G / B / S also dampens.

Die andere Sensoreinheit D2 berührt im gezeigten Beispiel nur einen vibrierfähigen Teil T der Halterung H/T der Sensoreinheit E, ohne die Sensoreinheit E selbst zu berühren. Zusätzlich stützt sich dieses andere Dämpfungselement D2 gegen den Boden B der Kammer G/B des Schaltungsgehäuse G/B/S ab, wodurch dieses andere Dämpfungselement D2 zusätzlich Vibrationen im Metall des Bodens B des Schaltungsgehäuses G/B/S dämpft.The other sensor unit D2 touches in the example shown only a vibratable part T of the holder H / T of the sensor unit E without touching the sensor unit E itself. In addition, this other damping element D2 is supported against the bottom B of the chamber G / B of the circuit housing G / B / S from which this additional damping element D2 additionally Vibrations in the metal of the bottom B of the circuit housing G / B / S dampens.

Das Dämpfungselement D1/D2 besteht erfindungsgemäß aus einer weichen nachgiebigen Masse, welche Vibrationsenergien dämpft, eben z.B. aus klebrigem, zähen, stark dämpfenden Asphalt, - zumindest enthält das Dämpfungselement erfindungsgemäß eine solche Vibrationen dämpfende Masse. Der Dämpfungselement D1/D2 dämpft bei einem - im Vergleich zu dem Stoß, welcher bei dem Unfall unmittelbar auf die Sensoreinheit E wirkt - harten Stoß die auftretenden mechanischen Erschütterungen der Sensoreinheit E.The damping element D1 / D2 consists according to the invention a soft, flexible mass, which vibrational energies dampens, e.g. made of sticky, tough, strongly damping Asphalt, - at least contains the damping element according to the invention such a vibration damping mass. Of the Damping element D1 / D2 dampens one - compared to the impact that directly hits the sensor unit in the accident E acts - hard impact the occurring mechanical Vibrations of the sensor unit E.

So kann sowohl das Dämpfungselement D1 als auch das Dämpfungselement D2 - z.B. beim Aufprall nach einem versehentlichen Fallenlassen des die Sensoreinheit E enthaltenden Schaltungsgehäuses G/B/S auf einen harten Steinplattenboden - die Mikromechanik M vor Bruch schützen, weil das Dämpfungselement D1 bzw. D2 jeweils weitgehend die dabei auftretenden Vibrationsenergien dämpft.So can both the damping element D1 and the damping element D2 - e.g. in the event of an accident Dropping the one containing the sensor unit E. Circuit housing G / B / S on a hard stone slab floor - Protect the micromechanics M from breakage because the damping element D1 and D2 largely each of those that occur Vibration energy dampens.

Der Stoß, welcher unmittelbar auf die Sensoreinheit bei dem Unfall wirkt, ist weich im Vergleich zu dem abrupten Stoß, welcher unmittelbar auf die Sensoreinheit beim Aufprall nach einem versehentlichen Fallenlassen der Sensoreinheit oder beim Fallenlassen eines die Sensoreinheit enthaltenden Schaltungsgehäuses wirkt. Der beim Unfall auf die Sensoreinheit E wirkende Stoß wird also praktisch ungedämpft aus die Sensoreinheit E übertragen, so daß diese Stoß bei der Erfindung durch die bruchempfindliche Mikromechanik M gemessen werden kann, - und zwar i.allg. ohne daß dieser Stoß die Mikromechanik M zerstören würde. Das Dämpfungselement dämpft also bevorzugt die hochfrequenten Komponenten der Vibrationen bei einem harten Stoß, aber bevorzugt nicht jene niederfrequenten Komponenten von mechanischen Erschütterungen, welche bei einem Unfall des Fahrzeuges auftreten und für die Elektronik als Anzeige für das Auftreten eines Unfalles dienen.The impact which is directly on the sensor unit at the Accident is soft compared to the abrupt impact, which directly on the sensor unit on impact after accidentally dropping the sensor unit or when dropping one containing the sensor unit Circuit housing acts. The one in the accident on the sensor unit E impact is practically undamped transmitted from the sensor unit E, so that this shock at the invention by the break-sensitive micromechanics M can be measured - in general. without this Impact would destroy the micromechanics M. The damping element therefore preferably dampens the high-frequency components the vibration from a hard impact, but preferably not those low-frequency components of mechanical shocks, which occur in an accident of the vehicle and for the electronics as an indication of the occurrence of a Serve accident.

Die Erfindung gestattet also, jene abrupten, harten Stöße unschädlich zu machen, welche z.B. während des Fertigung und Endmontage von Schaltungsgehäusen auftreten können, z.B. durch versehentliches Fallenlassen des bereits fertig mit der Elektronik und der Sensoreinheit E ausgestatteten Schaltungsgehäuse G/B/S, oder auch durch einen versehentlichen harten Schlag mit einem Werkzeug gegen das bereits in das Fahrzeug eingebaute Schaltungsgehäuse G/B/S. Die Erfindung vermeidet daher auch, daß Schaltungsgehäuse G/B/S versehentlich zusammen mit ihren auf solche Weise beschädigten defekten Sensoreinheiten E in ein Kfz eingebaut werden oder nach dem Einbau - womöglich unerkannterweise - beschädigt werden.The invention thus allows those abrupt, hard impacts to render harmless, e.g. during manufacturing and final assembly of circuit housings can occur e.g. by accidentally dropping the already finished equipped with the electronics and the sensor unit E. Circuit housing G / B / S, or by an accidental hard blow with a tool against that already in the vehicle built-in circuit housing G / B / S. The invention therefore also avoids that G / B / S circuit housing accidentally along with their so damaged defective sensor units E can be installed in a motor vehicle or after installation - possibly undetected - damaged will.

Die Erfindung gestattet, eine breite Vielzahl verschiedenster Massen als Dämpfungselement D1/D2 zu verwenden, so daß man sich - je nach den vorhandenen Fertigungseinrichtungen und je nach den sonstigen Bedürfnissen wie chemische Neutralität - eine optimale Masse aus der Vielzahl der grundsätzlich verwendbaren Massen aussuchen kann. So kann das Dämpfungselement D1/D2 statt einer asphaltartigen Masse z.B. auch Silikon-Gel, mäßig ausgehärtetes Klebermaterial, Kautschuk und / oder Polyurethan enthalten oder völlig aus solchen Massen bestehen.The invention allows a wide variety of different Masses to be used as damping element D1 / D2, so that one - depending on the existing manufacturing facilities and depending on other needs like chemical neutrality - an optimal mass from the multitude of basically usable masses can choose. So it can Damping element D1 / D2 instead of an asphalt-like mass e.g. also silicone gel, moderately hardened adhesive material, Contain rubber or / or polyurethane or completely such masses exist.

Wie Versuche zeigten, kann man bereits mit besonders wenig Dämpfungselement-Masse - und damit mit geringen zusätzlichen Gewicht des fertig montierten Schaltungsgehäuses G/B/S - eine deutliche Vorsorge gegen die Gefährdung durch Bruch bzw. durch bleibende Verformungen der Sensoranordnung erreichen, wenn sein Dämpfungselement D1/D2 mindestens 10 % der Oberfläche der Sensoreinheit E berührt.As experiments have shown, you can do it with very little Damping element mass - and thus with little additional Weight of the assembled circuit housing G / B / S - a clear precaution against the risk of breakage or due to permanent deformation of the sensor arrangement reach if its damping element D1 / D2 is at least 10% touches the surface of the sensor unit E.

Macht man aber die berührende Fläche größer als 10 % der Oberfläche der Sensoreinheit E, dann kann man, wie man schon gefühlsmäßig erfassen kann und wie auch Versuche zeigten, eine noch bessere Vorsorge gegen die Zerstörung des Sensoreinheit E erreichen. Besonders wichtig ist dies bei der Verwendung der besonders bruchgefährdeten Mikromechanik M als Sensoranordnung M. So kann man das Dämpfungselement D1 bzw. D2 auch mehr als 50% der Oberfläche der Sensoreinheit E bedecken lassen.But if you make the contact area larger than 10% of the Surface of the sensor unit E, then you can see how one can already grasp emotionally and like experiments showed even better precaution against destruction of the sensor unit E. This is particularly important when using the micromechanics that are particularly prone to breakage M as a sensor arrangement M. So you can the damping element D1 or D2 also more than 50% of the surface of the Have sensor unit E covered.

Eine besonders gute Vorsorge gegen die Gefährdung durch Bruch bzw. durch bleibende Verformungen der Sensoranordnung kann man dadurch erreichen, daß das Dämpfungselement D1/D2 - ausschließlich oder zusätzlich - einen im Prinzip beim Stoß vibrierfähigen Teil der Halterung H/T berührt. Bei dem in der Figur gezeigten Beispiel berührt das Dämpfungselement D2 alleine die Leiterplatte T, außerdem das Dämpfungselement D1 nicht nur die Sensorkapsel K sondern auch Teile des Bügels H. Dadurch werden die vom Schaltungsgehäuse G/B/S nach innen zur Sensoreinheit E fließenden Vibrationsenergien schon dann stark gedämpft, wenn sie sich über die Halterung T/H zum Sensoreinheit E hin ausbreiten.A particularly good precaution against the risk of Breakage or permanent deformation of the sensor arrangement can be achieved in that the damping element D1 / D2 - exclusively or additionally - one in principle with Impact vibratable part of the bracket H / T touched. In which in the example shown touches the damping element D2 alone the circuit board T, also the damping element D1 not only the sensor capsule K but also parts of the bracket H. This removes the from the circuit housing G / B / S vibrating energies flowing inwards to sensor unit E. strongly dampened when they are over the Spread bracket T / H towards sensor unit E.

Um die eigentliche Sensoranordnung M vor Verschmutzungen oder vor chemischen Angriffen durch das Dämpfungselement D1/D2 verschonen zu können, ist die Sensoreinheit E - wie beispielhaft in der Figur gezeigt ist - eine Sensorkapsel K enthalten, in welcher die eigentliche, gegen Beschleunigungen und / oder Verzögerungen empfindliche Sensoranordnung M befestigt ist.To the actual sensor arrangement M against contamination or from chemical attacks by the damping element To be able to spare D1 / D2 is the sensor unit E - wie is shown by way of example in the figure - a sensor capsule K included, in which the actual, against accelerations and / or delays sensitive sensor arrangement M is attached.

Man kann die Vibrationsenergien noch besser dadurch dämpfen, daß die Dämpfungselemente D1/D2 nicht nur oberflächlich die Sensoreinheit E - bzw. unmittelbar deren Sensoranordnung M - bedecken, sondern daß die Dämpfungselemente D1/D2 sich zusätzlich von innen her gegen das äußere Gehäuse abstützen, also zumindest einen Teil eines Raumes zwischen der Sensoreinheit E und einem äußeren Gehäuse G/B ausfüllen. Dann dämpft das Dämpfungselement D1/D2 nämlich jeweils zusätzlich die Vibrationen des äußeren Gehäuses, schon bevor diese sich über die Halterung T/H auf das Sensoreinheit E ausbreiten.You can dampen the vibration energies even better by that the damping elements D1 / D2 are not only superficial the sensor unit E - or directly its sensor arrangement M - cover, but that the damping elements D1 / D2 are also from the inside against the outer housing support, i.e. at least part of a room between the sensor unit E and an outer housing G / B to complete. Then the damping element D1 / D2 namely namely each additionally the vibrations of the outer housing, even before this is on the bracket T / H on the sensor unit Spread E.

Um - wie bereits in der Figur gezeigt ist - die Sensoreinheit E geschickt in einem Schaltungsgehäuse G/B/S so unterzubringen,

  • daß das Schaltungsgehäuse G/B/S die von der Sensoreinheit E gesteuerte Elektronik aufnehmen kann,
  • daß die Sensoreinheit E in einer engen eigenen Kammer G/B unter wenig Aufwand für die Dämpfungselement-Masse anzubringen ist und mit wenig zusätzlichen Gewicht erfindungsgemäß gegen die harten Stöße geschützt wird, und
  • daß leicht vermieden werden kann, daß die Elektronik selbst durch Dämpfungselement-Massen verschmutzt wird,
kann in dem Schaltungsgehäuse G/B/S eine das äußere Gehäuse G/B bildende Kammer G/B angebracht werden,
  • in welcher die Sensoreinheit E befestigt ist und
  • deren freier Raum teilweise mit dem Dämpfungselement D1/D2 ausgefüllt ist.
In order - as already shown in the figure - to cleverly accommodate the sensor unit E in a circuit housing G / B / S,
  • that the G / B / S circuit housing can accommodate the electronics controlled by the sensor unit E,
  • that the sensor unit E can be installed in a narrow separate chamber G / B with little effort for the damping element mass and is protected against the hard impacts according to the invention with little additional weight, and
  • that it can easily be avoided that the electronics themselves are contaminated by damping element masses,
a chamber G / B forming the outer housing G / B can be fitted in the circuit housing G / B / S,
  • in which the sensor unit E is attached and
  • whose free space is partially filled with the damping element D1 / D2.

Claims (7)

  1. Sensor unit (E) for controlling a passenger protection system of a vehicle, having a sensor arrangement (M) with a seismic mass for detecting an acceleration, and with a sensor capsule (K) which contains the sensor arrangement (M), characterized
    in that the sensor unit (E) is mechanically relatively rigidly connected to a printed circuit board (T) in an electrically conductive fashion,
    in that the printed circuit board (T) is mounted in a housing (G/B/S),
    in that the space between the sensor capsule (K) and the housing (G/B) is filled partially with a resilient damping element (D1/D2), and
    in that the sensor capsule (K) and the housing (G/B/S) are touched by the damping element (D1/D2) over part of their surfaces.
  2. Sensor unit (E) according to Claim 1, characterized in that the damping element (D1/D2) contains silicone gel or consists of silicone gel.
  3. Sensor unit (E) according to Claim 1, characterized in that the damping element (D1/D2) contains asphalt-like material or consists of asphalt-like material.
  4. Sensor unit (E) according to Claim 1, characterized in that the damping element (D1/D2) contains moderately cured adhesive material or consists of a moderately cured adhesive material.
  5. Sensor unit (E) according to Claim 1, characterized in that the damping element (D1/D2) contains rubber or consists of rubber.
  6. Sensor unit (E) according to Claim 1, characterized in that the damping element (D1/D2) contains polyurethane or consists of polyurethane.
  7. Sensor unit (E) according to Claim 1, characterized in that the housing (G/B/S) has a chamber (G/B) which contains the damping element (D1).
EP92106898A 1992-04-22 1992-04-22 Detector unit for controlling a passenger protection system of a vehicle Expired - Lifetime EP0566758B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP92106898A EP0566758B2 (en) 1992-04-22 1992-04-22 Detector unit for controlling a passenger protection system of a vehicle
DE59207007T DE59207007D1 (en) 1992-04-22 1992-04-22 Sensor unit for controlling an occupant protection system of a vehicle
CA002094460A CA2094460A1 (en) 1992-04-22 1993-04-20 Sensor unit for controlling a passenger restraint system in a vehicle
JP5117590A JPH0616097A (en) 1992-04-22 1993-04-22 Sensor unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92106898A EP0566758B2 (en) 1992-04-22 1992-04-22 Detector unit for controlling a passenger protection system of a vehicle

Publications (3)

Publication Number Publication Date
EP0566758A1 EP0566758A1 (en) 1993-10-27
EP0566758B1 EP0566758B1 (en) 1996-08-28
EP0566758B2 true EP0566758B2 (en) 1999-09-08

Family

ID=8209563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106898A Expired - Lifetime EP0566758B2 (en) 1992-04-22 1992-04-22 Detector unit for controlling a passenger protection system of a vehicle

Country Status (4)

Country Link
EP (1) EP0566758B2 (en)
JP (1) JPH0616097A (en)
CA (1) CA2094460A1 (en)
DE (1) DE59207007D1 (en)

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Also Published As

Publication number Publication date
DE59207007D1 (en) 1996-10-02
EP0566758A1 (en) 1993-10-27
JPH0616097A (en) 1994-01-25
CA2094460A1 (en) 1993-10-23
EP0566758B1 (en) 1996-08-28

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